I just visited my local Sainsbury store (Rugby, Warwickshire) to buy my son a halloween dracula suit for Wednesday night and it was £10 but when it went through the till it came out as £5, although it may be a glitch I am guessing they want to get rid of stock asap to free up space for xmas stock WARNING I could be wrong.
Their are no signs saying half price.

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hi i was in sainsbury's in the galleries and they have all the halloween outfits reduced there, i got a skeleton dress up for £2.40 and it was supposed to be £8 alot were reduced more than 50% not sure if its nation wide but the staff were marking everything down while i was there.

Unfortunately I work for sainsbury's :cry::cry::cry::cry::cry: and i can confirm also that they are clearing the Halloween stock.. don't know if all stores are the same but we only have kids costumes at ours